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AT-MGS-402 User Manual
B
A GND SH
Refer to the AT-MGS-410 User Manual or Quick Start Guide for location and connection of the corresponding
Modbus terminal block in the AT-MGS-410 gas sensor.
NOTE:
Ensure that the corresponding wire colors noted above are connected to the correct ‘B’ and
‘A’ terminals in the Modbus terminal block in the AT-MGS-410 gas sensor and the ground and drain
are properly terminated according to Modbus protocol.
3.6.2 Integration with Building Management System
A second Modbus connection is available in the AT- MGS-402 to connect to a Building Management System
(BMS)
. The physical connections are made the same as described above in section 3.6.1 but using the
Modbus/BMS terminal block
(item 3 in “Figure 2-3 - AT-MGS-402 Layout” on page 7)
.
1. Locate the Modbus / BMS terminal block in the AT-MGS-402.
2. Feed Belden 3106A or equivalent cable through one of the M16 cable glands
(item 13 in “Figure
2-3 - AT-MGS-402 Layout” on page 7)
and connect to the appropriate terminals noting the
color of the wire.
3. Make similar connections to the BMS noting wire color.
4. Controller/BMS Modbus configuration will need to be completed in section 4.2, Controller Setup.
3.7 Connecting External Alarms
3.7.1 Overview
In addition to the integrated visual and audible alarms there are several outputs available in the AT-MGS-402 to
interface with external ventilation, external equipment or for connection to a BMS or buildings fire safety panel.
